Question

我已经编写了一个使用thread上传文件的代码。我在页面上放置了一个简单的文件上传控件和一个按钮。代码看起来像这样 -

Protected Sub btnUpload_Click(ByVal sender As Object,
                               ByVal e As EventArgs) Handles btnUpload.Click
    Dim timeStart As TimeSpan = Nothing
    Dim timeEnd As TimeSpan = Nothing
    Dim timeDiff As TimeSpan = Nothing
    Dim ex As Exception = Nothing
    Dim FileNameWithoutExtension As String = String.Empty

    Try
        Dim objTh As Thread = Nothing
        objTh = New Thread(AddressOf SaveFileByBuffering)
        timeStart = DateTime.Now.TimeOfDay
        objTh.IsBackground = True


        FileNameWithoutExtension = System.IO.Path.GetFileName(FldUploadThreading.FileName)
        objTh.Start("New_" + FileNameWithoutExtension)
        objTh.Name = "ARAThreadFileBuffer"
        objTh.Join()

        timeEnd = DateTime.Now.TimeOfDay
        timeDiff = timeEnd - timeStart

    Catch exThAbort As ThreadAbortException
        ex = exThAbort
    Catch exTh As ThreadStartException
        ex = exTh
    Catch exCommon As Exception
        ex = exCommon
    End Try

End Sub

使用线程调用的方法：

Public Function SaveFileByBuffering(ByVal lstrFilePath As String)
    Dim bufferSize As Integer = 512
    Dim buffer As Byte() = New Byte(bufferSize - 1) {}


    Dim pathUrl As String = ConfigurationManager.AppSettings("strFilePath").ToString()

    Dim uploadObj As UploadDetail = New UploadDetail()
    uploadObj.IsReady = True
    uploadObj.FileName = lstrFilePath
    uploadObj.ContentLength = Me.FldUploadThreading.PostedFile.ContentLength

    Me.Session("UploadXDetail") = uploadObj

    Dim Upload As UploadDetail = DirectCast(Me.Session("UploadXDetail"), UploadDetail)

    Dim fileName As String = Path.GetFileName(Me.FldUploadThreading.PostedFile.FileName)

    Using fs As New FileStream(Path.Combine(pathUrl, lstrFilePath), FileMode.Create)
        While Upload.UploadedLength < Upload.ContentLength
            Dim bytes As Integer = Me.FldUploadThreading.PostedFile.InputStream.Read(buffer, 0, bufferSize)
            fs.Write(buffer, 0, bytes)
            Upload.UploadedLength += bytes
        End While
    End Using
End Function

有两个问题：

当某人同时点击同一个按钮时，线程行为会以不同的方式工作，某些时间页会崩溃。
当我在具有60个用户的多用户环境中测试此过程并且文件大小为25 MB时，每个用户页面崩溃。

我有.net 3.5所以我没有选择2010年或更高版本的文件上传的高级版本。

使用线程上传文件

0 个答案: